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<pre><span class="sourceLineNo">001</span><a id="line.1">/*</a>
<span class="sourceLineNo">002</span><a id="line.2"> * Licensed to the Apache Software Foundation (ASF) under one or more</a>
<span class="sourceLineNo">003</span><a id="line.3"> * contributor license agreements.  See the NOTICE file distributed with</a>
<span class="sourceLineNo">004</span><a id="line.4"> * this work for additional information regarding copyright ownership.</a>
<span class="sourceLineNo">005</span><a id="line.5"> * The ASF licenses this file to You under the Apache License, Version 2.0</a>
<span class="sourceLineNo">006</span><a id="line.6"> * (the "License"); you may not use this file except in compliance with</a>
<span class="sourceLineNo">007</span><a id="line.7"> * the License.  You may obtain a copy of the License at</a>
<span class="sourceLineNo">008</span><a id="line.8"> *</a>
<span class="sourceLineNo">009</span><a id="line.9"> *      http://www.apache.org/licenses/LICENSE-2.0</a>
<span class="sourceLineNo">010</span><a id="line.10"> *</a>
<span class="sourceLineNo">011</span><a id="line.11"> * Unless required by applicable law or agreed to in writing, software</a>
<span class="sourceLineNo">012</span><a id="line.12"> * distributed under the License is distributed on an "AS IS" BASIS,</a>
<span class="sourceLineNo">013</span><a id="line.13"> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</a>
<span class="sourceLineNo">014</span><a id="line.14"> * See the License for the specific language governing permissions and</a>
<span class="sourceLineNo">015</span><a id="line.15"> * limitations under the License.</a>
<span class="sourceLineNo">016</span><a id="line.16"> */</a>
<span class="sourceLineNo">017</span><a id="line.17">package org.apache.commons.dbutils;</a>
<span class="sourceLineNo">018</span><a id="line.18"></a>
<span class="sourceLineNo">019</span><a id="line.19">import java.lang.reflect.InvocationHandler;</a>
<span class="sourceLineNo">020</span><a id="line.20">import java.lang.reflect.Proxy;</a>
<span class="sourceLineNo">021</span><a id="line.21">import java.sql.CallableStatement;</a>
<span class="sourceLineNo">022</span><a id="line.22">import java.sql.Connection;</a>
<span class="sourceLineNo">023</span><a id="line.23">import java.sql.Driver;</a>
<span class="sourceLineNo">024</span><a id="line.24">import java.sql.PreparedStatement;</a>
<span class="sourceLineNo">025</span><a id="line.25">import java.sql.ResultSet;</a>
<span class="sourceLineNo">026</span><a id="line.26">import java.sql.ResultSetMetaData;</a>
<span class="sourceLineNo">027</span><a id="line.27">import java.sql.Statement;</a>
<span class="sourceLineNo">028</span><a id="line.28"></a>
<span class="sourceLineNo">029</span><a id="line.29">/**</a>
<span class="sourceLineNo">030</span><a id="line.30"> * Creates proxy implementations of JDBC interfaces.  This avoids</a>
<span class="sourceLineNo">031</span><a id="line.31"> * incompatibilities between the JDBC 2 and JDBC 3 interfaces.  This class is</a>
<span class="sourceLineNo">032</span><a id="line.32"> * thread safe.</a>
<span class="sourceLineNo">033</span><a id="line.33"> *</a>
<span class="sourceLineNo">034</span><a id="line.34"> * @see java.lang.reflect.Proxy</a>
<span class="sourceLineNo">035</span><a id="line.35"> * @see java.lang.reflect.InvocationHandler</a>
<span class="sourceLineNo">036</span><a id="line.36"> */</a>
<span class="sourceLineNo">037</span><a id="line.37">public class ProxyFactory {</a>
<span class="sourceLineNo">038</span><a id="line.38"></a>
<span class="sourceLineNo">039</span><a id="line.39">    /**</a>
<span class="sourceLineNo">040</span><a id="line.40">     * The Singleton instance of this class.</a>
<span class="sourceLineNo">041</span><a id="line.41">     */</a>
<span class="sourceLineNo">042</span><a id="line.42">    private static final ProxyFactory instance = new ProxyFactory();</a>
<span class="sourceLineNo">043</span><a id="line.43"></a>
<span class="sourceLineNo">044</span><a id="line.44">    /**</a>
<span class="sourceLineNo">045</span><a id="line.45">     * Returns the Singleton instance of this class.</a>
<span class="sourceLineNo">046</span><a id="line.46">     *</a>
<span class="sourceLineNo">047</span><a id="line.47">     * @return singleton instance</a>
<span class="sourceLineNo">048</span><a id="line.48">     */</a>
<span class="sourceLineNo">049</span><a id="line.49">    public static ProxyFactory instance() {</a>
<span class="sourceLineNo">050</span><a id="line.50">        return instance;</a>
<span class="sourceLineNo">051</span><a id="line.51">    }</a>
<span class="sourceLineNo">052</span><a id="line.52"></a>
<span class="sourceLineNo">053</span><a id="line.53">    /**</a>
<span class="sourceLineNo">054</span><a id="line.54">     * Protected constructor for ProxyFactory subclasses to use.</a>
<span class="sourceLineNo">055</span><a id="line.55">     */</a>
<span class="sourceLineNo">056</span><a id="line.56">    protected ProxyFactory() {</a>
<span class="sourceLineNo">057</span><a id="line.57">        super();</a>
<span class="sourceLineNo">058</span><a id="line.58">    }</a>
<span class="sourceLineNo">059</span><a id="line.59"></a>
<span class="sourceLineNo">060</span><a id="line.60">    /**</a>
<span class="sourceLineNo">061</span><a id="line.61">     * Convenience method to generate a single-interface proxy using the handler's classloader</a>
<span class="sourceLineNo">062</span><a id="line.62">     *</a>
<span class="sourceLineNo">063</span><a id="line.63">     * @param &lt;T&gt; The type of object to proxy</a>
<span class="sourceLineNo">064</span><a id="line.64">     * @param type The type of object to proxy</a>
<span class="sourceLineNo">065</span><a id="line.65">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">066</span><a id="line.66">     * @return proxied object</a>
<span class="sourceLineNo">067</span><a id="line.67">     */</a>
<span class="sourceLineNo">068</span><a id="line.68">    public &lt;T&gt; T newProxyInstance(final Class&lt;T&gt; type, final InvocationHandler handler) {</a>
<span class="sourceLineNo">069</span><a id="line.69">        return type.cast(Proxy.newProxyInstance(handler.getClass().getClassLoader(), new Class&lt;?&gt;[] {type}, handler));</a>
<span class="sourceLineNo">070</span><a id="line.70">    }</a>
<span class="sourceLineNo">071</span><a id="line.71"></a>
<span class="sourceLineNo">072</span><a id="line.72">    /**</a>
<span class="sourceLineNo">073</span><a id="line.73">     * Creates a new proxy {@code CallableStatement} object.</a>
<span class="sourceLineNo">074</span><a id="line.74">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">075</span><a id="line.75">     * @return proxied CallableStatement</a>
<span class="sourceLineNo">076</span><a id="line.76">     */</a>
<span class="sourceLineNo">077</span><a id="line.77">    public CallableStatement createCallableStatement(final InvocationHandler handler) {</a>
<span class="sourceLineNo">078</span><a id="line.78">        return newProxyInstance(CallableStatement.class, handler);</a>
<span class="sourceLineNo">079</span><a id="line.79">    }</a>
<span class="sourceLineNo">080</span><a id="line.80"></a>
<span class="sourceLineNo">081</span><a id="line.81">    /**</a>
<span class="sourceLineNo">082</span><a id="line.82">     * Creates a new proxy {@code Connection} object.</a>
<span class="sourceLineNo">083</span><a id="line.83">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">084</span><a id="line.84">     * @return proxied Connection</a>
<span class="sourceLineNo">085</span><a id="line.85">     */</a>
<span class="sourceLineNo">086</span><a id="line.86">    public Connection createConnection(final InvocationHandler handler) {</a>
<span class="sourceLineNo">087</span><a id="line.87">        return newProxyInstance(Connection.class, handler);</a>
<span class="sourceLineNo">088</span><a id="line.88">    }</a>
<span class="sourceLineNo">089</span><a id="line.89"></a>
<span class="sourceLineNo">090</span><a id="line.90">    /**</a>
<span class="sourceLineNo">091</span><a id="line.91">     * Creates a new proxy {@code Driver} object.</a>
<span class="sourceLineNo">092</span><a id="line.92">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">093</span><a id="line.93">     * @return proxied Driver</a>
<span class="sourceLineNo">094</span><a id="line.94">     */</a>
<span class="sourceLineNo">095</span><a id="line.95">    public Driver createDriver(final InvocationHandler handler) {</a>
<span class="sourceLineNo">096</span><a id="line.96">        return newProxyInstance(Driver.class, handler);</a>
<span class="sourceLineNo">097</span><a id="line.97">    }</a>
<span class="sourceLineNo">098</span><a id="line.98"></a>
<span class="sourceLineNo">099</span><a id="line.99">    /**</a>
<span class="sourceLineNo">100</span><a id="line.100">     * Creates a new proxy {@code PreparedStatement} object.</a>
<span class="sourceLineNo">101</span><a id="line.101">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">102</span><a id="line.102">     * @return proxied PreparedStatement</a>
<span class="sourceLineNo">103</span><a id="line.103">     */</a>
<span class="sourceLineNo">104</span><a id="line.104">    public PreparedStatement createPreparedStatement(final InvocationHandler handler) {</a>
<span class="sourceLineNo">105</span><a id="line.105">        return newProxyInstance(PreparedStatement.class, handler);</a>
<span class="sourceLineNo">106</span><a id="line.106">    }</a>
<span class="sourceLineNo">107</span><a id="line.107"></a>
<span class="sourceLineNo">108</span><a id="line.108">    /**</a>
<span class="sourceLineNo">109</span><a id="line.109">     * Creates a new proxy {@code ResultSet} object.</a>
<span class="sourceLineNo">110</span><a id="line.110">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">111</span><a id="line.111">     * @return proxied ResultSet</a>
<span class="sourceLineNo">112</span><a id="line.112">     */</a>
<span class="sourceLineNo">113</span><a id="line.113">    public ResultSet createResultSet(final InvocationHandler handler) {</a>
<span class="sourceLineNo">114</span><a id="line.114">        return newProxyInstance(ResultSet.class, handler);</a>
<span class="sourceLineNo">115</span><a id="line.115">    }</a>
<span class="sourceLineNo">116</span><a id="line.116"></a>
<span class="sourceLineNo">117</span><a id="line.117">    /**</a>
<span class="sourceLineNo">118</span><a id="line.118">     * Creates a new proxy {@code ResultSetMetaData} object.</a>
<span class="sourceLineNo">119</span><a id="line.119">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">120</span><a id="line.120">     * @return proxied ResultSetMetaData</a>
<span class="sourceLineNo">121</span><a id="line.121">     */</a>
<span class="sourceLineNo">122</span><a id="line.122">    public ResultSetMetaData createResultSetMetaData(final InvocationHandler handler) {</a>
<span class="sourceLineNo">123</span><a id="line.123">        return newProxyInstance(ResultSetMetaData.class, handler);</a>
<span class="sourceLineNo">124</span><a id="line.124">    }</a>
<span class="sourceLineNo">125</span><a id="line.125"></a>
<span class="sourceLineNo">126</span><a id="line.126">    /**</a>
<span class="sourceLineNo">127</span><a id="line.127">     * Creates a new proxy {@code Statement} object.</a>
<span class="sourceLineNo">128</span><a id="line.128">     * @param handler The handler that intercepts/overrides method calls.</a>
<span class="sourceLineNo">129</span><a id="line.129">     * @return proxied Statement</a>
<span class="sourceLineNo">130</span><a id="line.130">     */</a>
<span class="sourceLineNo">131</span><a id="line.131">    public Statement createStatement(final InvocationHandler handler) {</a>
<span class="sourceLineNo">132</span><a id="line.132">        return newProxyInstance(Statement.class, handler);</a>
<span class="sourceLineNo">133</span><a id="line.133">    }</a>
<span class="sourceLineNo">134</span><a id="line.134"></a>
<span class="sourceLineNo">135</span><a id="line.135">}</a>




























































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